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Domain structure of CoIr nanoalloys

Published online by Cambridge University Press:  11 April 2017

Evgeny Yu. Filatov Open the ORCID record for Evgeny Yu. Filatov [Opens in a new window] ,
Svetlana V. Cherepanova ,
Ilia V. Kochetygov ,
Yury V. Shubin  and
Sergey V. Korenev
Evgeny Yu. Filatov*
Affiliation:
Novosibirsk State University, Pirogova str. 2, 630090 Novosibirsk, Russian Federation Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentyev Ave. 3, 630090 Novosibirsk, Russian Federation
Svetlana V. Cherepanova
Affiliation:
Novosibirsk State University, Pirogova str. 2, 630090 Novosibirsk, Russian Federation Boreskov Institute of Catalysis SB RAS, Lavrentieva Ave. 5, 630090 Novosibirsk, Russian Federation
Ilia V. Kochetygov
Affiliation:
Novosibirsk State University, Pirogova str. 2, 630090 Novosibirsk, Russian Federation Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentyev Ave. 3, 630090 Novosibirsk, Russian Federation
Yury V. Shubin
Affiliation:
Novosibirsk State University, Pirogova str. 2, 630090 Novosibirsk, Russian Federation Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentyev Ave. 3, 630090 Novosibirsk, Russian Federation
Sergey V. Korenev
Affiliation:
Novosibirsk State University, Pirogova str. 2, 630090 Novosibirsk, Russian Federation Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentyev Ave. 3, 630090 Novosibirsk, Russian Federation
*
a)Author to whom correspondence should be addressed. Electronic mail: decan@niic.nsc.ru
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Abstract

X-ray diffraction (XRD) pattern of nanosized equimolar solid solution CoIr prepared by thermolysis of [Co(NH3)6][Ir(C2O4)3] contains peaks characteristic of both face-centered cubic (fcc) and hexagonal close-packed (hcp) structure. Moreover, 101 peak of hcp modification is substantially wider than 100 and 002 peaks, 102 and 103 are very broad and almost invisible. Peak 200 of fcc structure is wider than the other peaks of this modification and slightly shifted toward lower angles. It was shown by simulation of XRD patterns that particles of CoIr alloy are nanoheterogeneous and consist of lamellar domains having fcc and hcp structures. The best fit was obtained for the following model parameters: an average crystallites size is about 10 nm, average thicknesses of the fcc and hcp domains are 1.7 and 1.1 respectively. The presence of domain structure was confirmed by transmission electron microscopy data.

Keywords

domain structurepowder diffractionnanoparticlescobaltiridium
Type
Technical Articles
Information
Powder Diffraction , Volume 32 , Supplement S1 , September 2017 , pp. S155 - S159
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Copyright
Copyright © International Centre for Diffraction Data 2017 

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